Eccentric-crank-setting device



G. w. HAIN EGCENTRIC CRANK SETTING.DEVIGE Filed Dec. 2, 1925 May 22, 1928.

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Patented May 22, 1928.

j UNITED, STATES-PATENT oFFics.

GEORGE W. HAIN, F OEL'WEINLIOWAV f ECCENTRIC-GRANK-SETTING DEVICE.

Application filed December .2, 1925. Serial-No. 72.,852.

This invention relates to devices for setting eccentric crank arins for \Valschaert valve gear on the main crank pin of a,loco

i motive driving wheel.

One objectof this invention is to provide such a device which will eliminate the necessity of mathematical computation, and .will be adjustable so as to be usable with the various sizes of driving wheels 'andcrank arms used.

Another object is to, provide such a device winch may be easily and quickly clamped into position on the maincrank pin of a driving wheel and which may be quickly adjusted to the necessary positions thereon.

Still another object lSitO provide independent means on the device for checki ng the result obtained by its use. Other objects and advantages will appear by reference to the following specification whenconsidered in connection w1th the accompanying drawi ing wherein Ihave illustrated a selected embodlment of my'lnvention and inwhichs- F I is a front elevation.

. of Fig. 1, and i r Fig. 2 is a sectional view on the line 2-2 Fig. 3 isa diagrammatic illustration of n themethod of using-the device..-

bythe arms T and S-WhlClI are adapted to be' a seated against the main crank pin 0 of a= locomotive drivingwheel. A suitable chain Referring now to the drawings, my improved devlce'eomprises a supporting member fi'provided at its lower end with a foot 7 member 6 having a forked lower end formed or strap 9 is secured atone end to the fork arm 7 aselearly shownin Fig. 1, and is provided at its other end with a screw threaded end bolt 10 and nut 11 whereby the said chain or strap may be drawn tightly around i thecrank pin C to'hold the supporting member 5 in the desired position.

On the upper end of the supporting mem- 1 here is mounted a head frame 12. This head frame is adjustably mounted on the said *member'5- by means of a bearing block F13secured to the frame 12 in any suitable manner and apertured to slide over the supi v a porting barasmostclearly shown in Fig. '2.

A set serew'lt is provided in the bearing block to hold it in the desired position on the supportingmcmber. At the upper end of, .the head framea gauge G is provided which hereinafter explainmi This gauge comprises "is adapted toindic'ate in degrees the angu larityof the eccentric crank arm, as Wlll he .means of a thumb nut 19 in a well known fing; member 5 through which the locating pin 20 maybe passed so that a single pin as illustrated may serve on"oppositesides of the device wherebythe provision of two separate' pins is avoided. The purpose of; this pin will, bemore. fully set forth in the we .planation of the useof the device following.

. w1th gauge G.

a weighted indicator 15 pivoted intere mediate its ends as at 16, and weighted at 17 whereby the hand is maintained in substan-' tia'lly vertical position, a suitable point being prov ded as indicated at 18 tozrender read ing more accurate. The dial or scale used in connection with the above described hand is preferably marked in degrees fronrzero to 45 degrees both ways from the zero "mark as shown in Fig. 1, and this dial isrotatably mounted on the said head frame 12,:and may be clamped into the desired position by manner. i I Y A locating pin 20 is adjust-ably mounted in the head frame, 12 by being passed througha bushing21 secured to thehead frame in-any suitable manner. The aperture in the bushing 2lthrough which the pin 20 is passed, of such a size that thepin may be slid therethrough but will be held in any desired position ,bythe tightness ofthe fit. A suitable slot 2st isiprovided in thegsupport- Another gauge X similarfin construction to the gauge Gr above described is provided at the lower end of the supporting bar and isfor-the purpose of checking the seating obtained by use of the gauge G. This gauge comprises a similar weighted indicator ed on the eccentric crank pin E at a certain angle with respect to a line between the center of the driving wheel and the center of the crank pin. The first operation in finding this angle, is to set the device. on the crank pin C as illustrated in Fig. 1 and diagrammatically in dotted lines in Fig. :3,

thento adjust the head frame 12 until the locating pin 20 coincides with the center of the driving wheel in which position it may be secured by means of the set screw let. The device may then be fastened in this position by means of the clamping chain 9 and thumb nut 11. With the device in this position the gauge G is rotated until the point 18 of the indicator hand indicates zero degrees and in which position it may be secured by the thumb nut 19.

The next operation is to loosen the set screw 14 and to adjust the head frame 12 on the supporting member 5 until the other end of the locating pin 20 coincides with the center at the free end of the eccentric crank arm F in which position it is again secured by tightening the set screw 14-. At this point the dial of gauge G is reset so that the hand 15 will indicate the required number of degrees, the direction of rotation in setting of the dial being governed by the side of the drive wheel centi'zr to which the crank arm is to be set. The clamping member 9 is next loosened so that the device may be swung on the crank pin C until the reading of the gauge G is again zero as indicated at P in which position the device issecured by tightening the clamping member 9. The crank arm F is now adjusted on the eccentric crank pin ID until the center at the free. end coincides with the locating pin 20 in which position the arm may be secured by tightening the clamping bolt f at the lower end thereof. To check the setting, the gauge X is consulted and the reading thereof should be the required number of degrees from its reading in the initial position. Vith the eccentric crank arm thus located the crank pin is ready for laying ofi, drilling, reaming, and chipping of key-way.

It will be readily seen that I have provided a device for setting eccentric crank arms for \Valschaert valve gear which is of simple and rigid construction and which eliminates the necessity of mathematical computation.

By placing the gauge G on the outer end of the device I prevent the crank arm from covering it and thereby secure easy reading thereof regardless of the position of the driving wheel. It should be noted that this device may be used in the manner above described regardless of the position of the crank pin on the driving wheel, that is, it is not necessary thatthe crank pin be directly below or above the center of the wheel. This device makes it possible to set the crank arm before the wheel is put under a locomotive whereby it is possible to use power driven machinery in the drilling and key way cutting, whereas if the arm is to be positioned after the wheel is applied it has in the past been necessary to do nearly all hand work. These features are obviously oi great advantage and effect large economics in manufacturing cost.

I am aware that changes in construction as well as in mode of use may be effected without departing from the essence of the invention and I reserve the right to make all such changes as fall within the scope of the following claims.

I claim as my invention:

1. In a device of the class described, a member having a foot end adapted to be seated against a shaft. :1 locating pin mounted on said member and a gauge also mounted on said member, said gauge comprising a rotatably'mounted dial member and a weighted indicator hand.

2. In a device of the class described, a member having a foot at one end thereof adapted to be seated against a shaft. :1 locating pin mounted on said member, a weighted element pivotally mounted on said member and adapted to assume a substantially vertical position and a rotatable member also mounted on said lirstnamed member and arranged to enact with said weighted element to indicate the angularit of the device.

3. In a device of the class described. an-

elongated member having a foot portion adapted to be seated on the crank pin of a locomotive driving wheel, a gauge on the other end of said member for determining the angular position of the device relative to the center of the driving wheel and locating means operative on opposite sides of said member respectively for facilitating positioning of the device relative to the cen ter of the driving wheel and the center of the free end of a crank arm mounted on said crank pin, said locating means being mounted on the member so as to be adjustable lengthwise thereof intermediate the foot and gauge ends thereof.

t. In a device of the class described, a member having a foot end adapted to be seated against a shaft, a gauge also mounted on said member and comprising an indicator hand pivotally mounted intermediate its ends and weighted at one end so asto assume a substantially vertical position in all operating positions of the device and an adjustably mounted scale arranged to coact with said hand to indicate changes in position of the device.

5. In a device of the class described, a member having a foot at one end adapted to engage a shaft. a gauge having a weighted indicator hand mounted on said member, another gauge having a weighted indicator hand and an adjustable scale mounted on said member at the other end thereof, and a locating pin adjustably mounted on said member intermediate its ends.

6. In a device of the class described, a member having a t oot at one and adapted to be seated against a crank pin on a locomotive drive wheel, a gauge mounted on said member and a double ended locating pin. mounted on said member so as to be adjustable longitudinally thereof, and also transversely therethrough for the purpose set forth.

7. In a device of the class described, the combination of a member having means for positioning the member on a locomotive drive wheel crank pin, means carried by said member for selectively positioning the device relative to the center of the drive wheel and the center of the free end of a crank arm carried by said crank pin, and agauge carried by said member for determining the angle defined by said drive wheel and crank arm centers and the center of said crank pin as the vertex of the angle.

8. In a device of the class described, the combination of a main body member, means adjacent one end of said member for seating that end on the crank pin of a locomotive driving Wheel intermediate the wheel and the outer end of the crank pin, means carried by said member for facilitating selective positioning of the device relative to the center of the driving Wheel and relative to the center of the free end of a crank arm mounted on the outer end of the crank pin, and a gauge carried by said member for indicating the angular position of the device when positioned according to the crank arm, relative to the position of the device when positioned according to the center of the driving wheel.

9. In a deviceof the class described, the combination of a main body member, means adjacent one end of said. member for seating that end on the crank pin of a locomotive driving wheel intermediate the wheel and the outer end of the crank pin, means carried by said member for facilitating selective po-,

sitioning of thedevice relative to the center of the driving Wheel and relative to the center of the free end of a crank arm mounted on the outer end of the crank pin, a gauge carried by said member for indicating the angular position of the device when positioned according to the crank arm, relative to the position of the device when positioned according to the center of the driving wheel, and means for locking the device in the desired position on the crank pin.

GEORGE W. HAIN. 

